msm: mdss: Check DSI controller status periodically

Send Bus-Turn-Around (BTA) command to check DSI controller
status periodically and check the response from controller.
Update appropriate response in frame buffer status node
if controller is not responding.

Sending BTA command is useful for the video/command mode
panels when it stops responding during ESD stability tests.

Change-Id: Ic8710943c0d56ea013af9ee6d378dabdda75d8f0
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>